Biology; Chemistry; Physics: Post your doubts here!

[Suchal Riaz]

They've asked only for uphill so, chemical energy ---> kinetic energy + gravitational potential energy + some heat energy.

no kinetic. speed is constant

 

[Saad Mughal]

thanks for pointing that out. guess i have to be more careful

ALWAYS read the question first, although I do the same sometimes, come to the answer directly.

 

[Saad Mughal]

no kinetic. speed is constant

The kinetic energy is constant but where does the kinetic energy come from? Chemical energy. Its not the answer, I was telling usama321 about what happens.

 

[asma tareen]

hmmm thnx i had actually forgotten chemical energy but when its gonna cycle down from hill wont the speed change??
i means cant it sccelarate???

 

[Saad Mughal]

hmmm thnx i had actually forgotten chemical energy but when its gonna cycle down from hill wont the speed change??
i means cant it sccelarate???

They haven't asked about downhill so you don't need to mention it!
But yes, when going downhill, the cyclist will accelerate.

 

[asma tareen]

they said A to B and B is on the other side of hill isnt it???

 

[asma tareen]

sorry i just read the half question my bad

 

[Saad Mughal]

sorry i just read the half question my bad

As I said before, ALWAYS read full questions.

 

[Saad Mughal]

sorry i just read the half question my bad

Do you have any more queries?

 

[asma tareen]

Do you have any more queries?

hmm well m gonna solve the paper further then ask thnx for asking and solving

 

[Saad Mughal]

hmm well m gonna solve the paper further then ask thnx for asking and solving

No problem. I just asked because I'm going offline.

 

[asma tareen]

No problem. I just asked because I'm going offline.

hmm thn i have a question i dunno its frm past papers but m gonna write some parts would u solve em???

 

[Saad Mughal]

hmm thn i have a question i dunno its frm past papers but m gonna write some parts would u solve em???

Yeah, sure.

 

[asma tareen]

the experiment in (a) is repeated using 72 g of water the heater supplies 7400J of thermal energy to water and temp rises to 23 C
calculate specific heat capacity???
are we gonna conver mass???

 

[Saad Mughal]

the experiment in (a) is repeated using 72 g of water the heater supplies 7400J of thermal energy to water and temp rises to 23 C
calculate specific heat capacity???
are we gonna conver mass???

Yes we are,
The unit for specific heat capacity is J/kg deg. C.
This means that the Specific heat capacity = 7400/(temp. diff. * 0.072) J/kg deg, C.

 

[asma tareen]

Yes we are,
The unit for specific heat capacity is J/kg deg. C.
This means that the Specific heat capacity = 7400/(temp. diff. * 0.072) J/kg deg, C.

hmm thnx

 

[Saad Mughal]

hmm thnx

 

[Saad Mughal]

Thanks for the 100th like!

 

[asma tareen]

hahaha ur welcome

Thanks for the 100th like!

 

[Suchal Riaz]

Yes we are,
The unit for specific heat capacity is J/kg deg. C.
This means that the Specific heat capacity = 7400/(temp. diff. * 0.072) J/kg deg, C.

so u also do these calculations by looking at units
i though that it was just me does not memorise "mltheta weeta blah blah" but look at units to get answer